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World Trade Center concourse opens for commuters in New York City area closed since 9/11

  • People view the newly opened commuter concourse, an underground walkway linking the World Trade Center PATH station with Brookfield Place, Thursday, Oct. 24, 2013 in New York. When fully completed, pedestrians will be able to continue to the transportation hub. (AP Photo/Mark Lennihan)

    People view the newly opened commuter concourse, an underground walkway linking the World Trade Center PATH station with Brookfield Place, Thursday, Oct. 24, 2013 in New York. When fully completed, pedestrians will be able to continue to the transportation hub. (AP Photo/Mark Lennihan)  (The Associated Press)

  • People view the newly opened commuter concourse, an underground walkway linking the World Trade Center PATH station with Brookfield Place, Thursday, Oct. 24, 2013 in New York. When fully completed, pedestrians will be able to continue to the transportation hub. (AP Photo/Mark Lennihan)

    People view the newly opened commuter concourse, an underground walkway linking the World Trade Center PATH station with Brookfield Place, Thursday, Oct. 24, 2013 in New York. When fully completed, pedestrians will be able to continue to the transportation hub. (AP Photo/Mark Lennihan)  (The Associated Press)

  • One World Trade Center, left, and Brookfield Place, right, are now linked by an underground concourse, Thursday, Oct. 24, 2013 in New York. The passageway, which runs beneath West St., opened Thursday. (AP Photo/Mark Lennihan)

    One World Trade Center, left, and Brookfield Place, right, are now linked by an underground concourse, Thursday, Oct. 24, 2013 in New York. The passageway, which runs beneath West St., opened Thursday. (AP Photo/Mark Lennihan)  (The Associated Press)

Commuters can once again walk beneath the World Trade Center site in an area that's been closed since 9/11.

The 600-foot-long, marble-paved passageway will accommodate mass-transit users going into and out of lower Manhattan.

The concourse will also eventually feature retail outlets.

The Port Authority of New York and New Jersey says the passageway replaces a critical transit connection that was lost in the terrorist attacks on Sept. 11, 2001.

The underground passageway runs west from the PATH station and underneath West Street. Pedestrians had been crossing the busy roadway or using a pedestrian bridge that's being dismantled.

The passageway is part of a nearly $4 billion redevelopment of the World Trade Center site that includes a new transportation hub scheduled to be completed in 2015.

A ribbon-cutting was held Thursday.